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Steve fMike, I know you're not a GAI fan.
They've done an LOA and COA on my 8x10" M101-2. It's not slabbed, but they've placed an invisible watermark with serial number on the back corner. I know, $80 for something that may or may not exist *insert dope slap*, but that was when I was young and stupid -last year.
It was a compromise to slabbing. Perhaps the other two Graders may offer this service. Steve F
grammar